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Host Header Name with DNS

In my organization, we have 3 web application that we use for internal use.
I have configured these on IIS 6.0 in Windows Server 2003 Standard Edition
with 3 different website but with same IP address but now I would like to
know that how can I make its entry in DNS to distinguish it for when out
users write URL in IE or any browser appropriate application is open. I
don't want to use port no. to distinguish it. So please kindly guide me in
this.

You need to create 3 host (A) records in your internal DNS for the 3
different host headers you used on the websites, and all 3 will point to
the same IP address of the server. If your internal domain is called
"domain.int" and the server IP is "192.168.1.20", then the entries will
look like [web1.web1.domain.int=192.168.1.20; web2.web2.domain.int=192.168.1.20;
web3.web3.domain.int=192.168.1.20]. Now when an internal user types
"web2.web2.domain.int" into their browser the DNS will resolve to the IIS
server and it will serve up the website with that host header.